6、创建一个对象提供swap方法，和test方法，test传入两个基本数据类型参数和一个引用类型参数，分别对它们进行swap，并查看结果。

public class Main
{
	public static void main(String[] args)
	{
		
		One one =  new One();
		int a = 10, b = 999;
		System.out.println("swap方法之前的a = "+a+",  b = "+b);
		one.swap(a,b);
		System.out.println("swap方法之后的a = "+a+",  b = "+b);

		//结果，并没有改变外面的a和b
	
		System.out.println("—————分割线——————");
		//以下采用传入实例的方法，也就是引用类型变量
		Two two = new Two(a,b);
		System.out.println("swap方法之前的two.a = "+two.a+",  two.b = "+two.b);
		one.swap(two);
		System.out.println("swap方法之后的two.a = "+two.a+",  two.b = "+two.b);

		//结果，two引用的也改变了，
		
	}
}

class One
{
	//基本数据类型
	public void swap(int a, int b)
	{
		var tmp = a;
		a = b;
		b = tmp;
		System.out.println("swap方法里的a = "+a+" , b = "+b);
	}

	//重写一个swap方法
	public void swap(Two two)
	{
		var tmp = two.a;
		two.a = two.b;
		two.b = tmp;
		System.out.println("swap方法里的a = "+two.a+" , b = "+two.b);
	
	}
}
class Two
{
	int a ,b;
	public Two(int a, int b)
	{
		this.a = a;
		this.b = b;
	}
}